The 6 best AI grammar checkers in 2025

We’ve all been there: You hit “Send” on an important email, only to spot a typo immediately. Or you finally publish that blog post you’ve been working on for a month, only to realize that one sentence makes sense to you and you alone. The frustration of unclear, clunky, or error-filled writing is real.

But what if you had a smart assistant to help you polish your writing in real time, ensuring it’s clear, readable, and error-free? Artificial intelligence (AI) grammar checkers can help. They go beyond simple spell-checking by examining clarity, tone, and readability to transform your writing from grammatically sound to compelling.

Cut through the hype with a list of the best AI grammar checkers based on real-life testing, not just a rundown of features from product pages.

What makes a great AI grammar checker?

Choosing the right AI writing assistant means looking beyond basic spell-checking. Key features that truly matter include

• Comprehensive grammar and punctuation correction
• Insightful enhancements for clarity
• Nuanced tone suggestions
• Multilingual support
• Integrations and extensions to boost your writing

A great AI grammar checker should be flexible, too, serving a variety of use cases, from crafting professional emails and refined blog posts to helping students with academic papers.

How I tested and selected the top AI grammar checkers

To compile this list, I ran 10 different grammar correction tools through a rigorous testing protocol:

• I refined several types of writing (blog posts, LinkedIn updates, professional emails, academic-style writing, etc.).
• I evaluated grammatical accuracy.
• I gauged user-friendliness of the interface and overall user experience.
• I played with any tone and style controls and suggestions.
• I monitored how distracting the tool was.

Some tools didn’t make the cut due to outdated user experiences, rigidity in their suggestions (not letting the writer’s own style peek through), intrusive and distracting ads, or overly aggressive upsell strategies. The six tools below are the ones that passed my test — the best AI grammar checkers in the bunch.

Best AI grammar checkers in 2025: A quick comparison

The best AI grammar checkers in 2025

Read on for a more detailed look at each of our top picks.

Best overall AI grammar checker: Grammarly

Pros of Grammarly:

• Comprehensive grammar, spelling, and punctuation checks
• Excellent tone detection and suggestions
• Built-in plagiarism checker (with upgrade)

Cons of Grammarly:

• Prone to over-suggesting
• Subscription required to access all features

Grammarly has almost become synonymous with grammar checking, and for good reason. It offers a robust set of features that cater to an array of writing needs, making it an excellent smart grammar checker for everyday use. Grammarly offers browser extensions, a desktop app, and mobile keyboards — so you can polish up your writing without interrupting your workflow. 

Grammarly goes beyond simple error correction, offering insightful suggestions for clarity, conciseness, and tone. If you opt for a paid plan, it can even help you detect plagiarism.

The user experience is generally smooth, with corrections and suggestions appearing in real time. The tone suggestions are particularly helpful for ensuring your message lands as intended, whether you’re writing a formal report or a casual email.

While the free version is perfectly capable of catching basic errors, the Premium version unlocks the full power of Grammarly’s AI, including advanced suggestions and full-sentence rewrites. One of my favorite upgrade features is the added check for inclusive language.

Plans/Pricing: The Free plan is available for basic spelling, grammar, and punctuation checks. Upgrade to the Pro plan for $12 per user per month to access full AI features, plus team features like a style guide, brand tone, and templated Snippets.

G2 rating: 4.7 out of 5 stars

Best AI grammar checker for storytelling: ProWritingAid

Pros of ProWritingAid:

• Extensive range of writing reports
• Strong integration with writing software
• Allows for custom style guides

Cons of ProWritingAid:

• The interface can be overwhelming for some users
• Real-time checking can sometimes lag with very large documents

For authors, bloggers, and anyone engaged in story-centric writing, ProWritingAid is a formidable AI writing assistant. The app offers a number of detailed reports that analyze your writing for everything from grammar, readability, and sentence length to style, clichés, and even pacing. This depth makes it particularly useful for novelists and content creators looking to refine narrative work. As a space for creative writers and authors, ProWritingAid takes security very seriously, fully encrypting your work for total peace of mind.

ProWritingAid integrates with popular writing software like Scrivener and Microsoft Word and also offers browser extensions — so it works wherever you do. Packed with information, the app’s interface can feel a bit more cluttered, but it does provide unparalleled insight into your writing habits and areas for improvement. Plus, you can create a custom style guide the app will use as a creative brief to help you maintain consistency across longer works or in team environments.

Plans/Pricing: The Free plan is available for basic grammar, spelling, and punctuation checks on up to 500 words. Upgrade to the Premium plan for $10 per month to get unlimited word count and reports and more advanced features.

G2 rating: 4.5 out of 5 stars

Best AI grammar checker for academic writing: Trinka

Pros of Trinka:

• Specialized for academic and technical writing
• Strong on consistency and formal style
• Understands subject-specific terminology

Cons of Trinka:

• Less intuitive for casual writing
• Limited free plan

Academic and technical writing demands precision and adherence to specific conventions — Trinka is specifically designed to handle those demands. While it doesn’t have the name recognition of a tool like Grammarly, Trinka’s specialization makes it a powerful ally for anyone producing scholarly or highly technical work — yet it’s still supremely easy to use, with a clean user interface and familiar right-hand tabs to view suggestions and access reports.

The app was the best I found for subject-specific corrections, consistency checks (e.g., for hyphenation, capitalization, etc.), citations, and ensuring your writing meets formal academic and technical standards.

Trinka understands the nuances of technical language and offers corrections for over 3,000 common grammar errors, including those often missed by general-purpose checkers (i.e., other apps on this list).

Plans/Pricing: The Free plan is available for up to 5,000 words per month and limited access to reports and AI features. Upgrade to the Premium plan for $6.67 per month for unlimited word count, additional access points, and advanced data privacy.

G2 rating: 4.1 out of 5 stars

Best AI grammar checker for Google ecosystem users: Gemini

Pros of Gemini:

• Embedded within Google Workspace
• Conversational AI chatbot
• Broad AI agent capabilities

Cons of Gemini:

• Not as specialized
• Limited access with free Google accounts

For those deeply embedded in the Google ecosystem (Gmail, Google Docs, Slides, Sheets, etc.), Gemini offers increasingly sophisticated AI-powered writing assistance. While it’s not really a standalone “grammar checker” in the sense of many others on this list, Gemini provides contextual help, from drafting and summarizing text to refining tone and — yes — correcting grammar and spelling.

Its strength lies in its seamless integration and conversational AI approach; it’s one of few AI grammar checkers that functions as a conversational chatbot. As seen in features like “Help me write” in Google Docs, Gemini can act as an AI writing assistant, suggesting phrasing, improving clarity, ensuring your grammar is sound, and even drafting an executive summary of what you’ve written. Plus, Gemini also works across the whole Google Workspace ecosystem, meaning you can get writing help in Gmail, Google Slides, and more. Gemini fits right within the flow of your existing work. 

Plans/Pricing: It’s free to use Gemini on its own with limits. Upgrade to the Google Workspace Business Standard plan for $14 per user per month (or Google One AI Premium for $19.99 per month) to use Gemini inside other Google Workspace apps.

G2 rating: 4.4 out of 5 stars

Best AI grammar checker for concise, simple writing: Hemingway Editor

Pros of Hemingway Editor:

• Excellent for improving clarity and conciseness
• Simple, visual interface

Cons of Hemingway Editor:

• Less comprehensive than some
• Suggestions can be rigid and overly simplistic

I’ve used Hemingway Editor on and off for years. I’ve watched it evolve and add AI features, but it’s always maintained a supremely user-friendly and navigable interface.

Hemingway focuses on bold and clear writing. It doesn’t just look for grammatical errors; it highlights adverbs, passive voice, overly complex sentences, and words with simpler alternatives. If your goal is to write direct, impactful, and easily readable content, Hemingway is an excellent sentence fixer AI.

It uses a color-coded system to flag different issues, making it easy to see where your writing can be tightened. While its grammar checking isn’t as exhaustive as some other tools I tested, the focus on clarity and conciseness is unique and highly effective. It’s less about catching every tiny detail and more about improving the overall structure and impact of your writing.

Plans/Pricing:The Free plan is available for basic features. Upgrade to the Editor Plus plan (starting at $8.33 per month) to add AI features.

G2 rating: 4.4 out of 5 stars

Best AI grammar checker for multilingual support: LanguageTool

Pros of LanguageTool:

• Extensive multilingual support (over 25 languages)
• Clear explanations for corrections

Cons of LanguageTool:

• Basic features on the free plan
• Less advanced English grammar checking

If you need to write in multiple languages, LanguageTool is your best bet. The app stands out, offering grammar, style, and spelling checks in over 25 languages (including English, Spanish, German, French, and Portuguese). This makes it an indispensable grammar AI tool for translators, international businesses, and language learners.

You can even choose between six different versions of English: American, British, Canadian, Australian, New Zealand, and South African — a serious perk if you’re like me and write for audiences across these regions.

You can use LanguageTool via the website or browser extensions, or as an add-on for Google Docs and Microsoft Word. It offers a clean interface and clear explanations for corrections. One of my favorite features is the option to toggle on “Picky Mode” to provide deeper, more nuanced tone, style, and word-choice suggestions.

Plans/Pricing: LanguageTool is free for basic grammar checking. Upgrade to the Premium plan for $5.83 per month to get additional spelling, grammar, and punctuation checks, plus AI paraphrasing help, a style guide feature, and more.

G2 rating: 4.4 out of 5 stars

Make clarity automatic with the best AI writing tools

The era of AI grammar checkers being mere typo-catchers is over. More than just spell-checkers, today’s tools are sophisticated writing partners that help you develop clearer, more impactful, and more intentional writing. AI handles the heavy lifting of grammar and style so you can focus on your ideas.

Whether you need a comprehensive smart grammar checker for daily use, a detailed AI writing assistant for long-form content, a specialized grammar AI tool for academic work, or a versatile sentence fixer AI for multiple languages, there’s an option on this list for you.

The best way to find your perfect fit is to test one or two of these tools (most offer a limited free plan or free trial) and experience the difference in your writing.